The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 26 |
| 3 | 430 |
| 4 | 10872 |
| 5 | 373664 |
| 6 | 16295152 |
| 7 | 862486944 |
| 8 | 53729041280 |
| 9 | 3851892172288 |
| 10 | 312411790027776 |
| 11 | 28284076403710208 |
| 12 | 2827642792215049216 |
| 13 | 309396856974126428160 |
| 14 | 36777992050266076762112 |
| 15 | 4719560392385576181243904 |
| 16 | 650284066459536965937364992 |
| 17 | 95752333835299098922624876544 |
| 18 | 15005473998204120386383308390400 |
[1,3,26,430,10872,373664,16295152,862486944, 53729041280,3851892172288,312411790027776, 28284076403710208,2827642792215049216, 309396856974126428160,36777992050266076762112, 4719560392385576181243904, 650284066459536965937364992, 95752333835299098922624876544, 15005473998204120386383308390400] |